Hoist mechanism for power loaders



May 18 1926.

5. SHAFER, JR" ET AL HOIST MECHANISM FOR POWER LOADERS Filed Feb. 1924gvvventop ZZo dHZbueyZr Patented May 18,

STATES PATENT are SAM'EL EE SHAFEE, 51%., AND LLOYD H.

DBAEGER, OF MILWAUKEE, WISCONSIN, AS-

SlGNOR-S TO CIT/Milt BELT CGMPANY, OF IvIILWAUKEE, WISCONSIN, ACORPORATION OF VIISGONSIN.

H0131 MECHANISM FOR FOWER LOADERS.

Application filed February 2?, 1924:.

This invention relates to loading apparatus in which a vessel thatreceives the load or charge is periodically moved froin a receiving to adischarging position; andthe invention has for its object to apply thepower that move said charging vessel to advantage, to simplify theconstruction of the mechanism by which the loading vessel is operated,and to arrange these so that the vertical dimensions of the apparatuswhen in positions of rest are reduced to the minimum. Our invention isprimarily intended for use in connection with a charging or loading skipfor a concrete mixer, wnose movements are controlled by a cable; we wishit to be understood, however, that the inven tion in its usefulapplications is not limited to a loader for concrete mixers, but ratheris adapted for a wide variety of uses.

In the accompanying drawings Figure 1 is a side view of a loading skipor hopper for a concrete mixing machine, to which our invention isapplied, the receiving position of the skip and its associated andcooperating parts, being represented in full lines, the dischargingposition thereof by dotted lines, and an intermediate position by dotand dash lines.

Fig. 2 is a rear elevation of the apparatus.

In the accompanying drawings, A designates the framework of a concretemixing machine, the drum of which is designated 15. C represents theloading skip or hopper into which, when resting upon the ground or in alowered position, a charge of materials to be mixed is delivered, andwhich when moved to the position indicated by dotted lines in Fig. 1,discharges such charge into the drum B. The skip O is formed with aforward spout section a and a rear loading section adapted to rest uponthe ground when the skip is lowered, the latter section preferablyhaving flaring side walls to give capacity to the loader without undulyincreasing its length, as represented in Fig. 2. The spout portion ofthe skip has secured to its opposite sides the bars D which arepivotally connected, at E, E, with the frame of the machine. The partsthus far described are well known in the art and serve to locate thepivot of the skip in advance of the nose or forward end of the spoutsection 0 thereof.

Serial No. 695,461.

2, 2 indicate a pair of stiiilegs pivot-ally secured, at 3, 3, to theframe of the machine, at the opposite sides thereof,- being located suchdistance apart as to permit the spoutsection 0 of the loading skip tolie and move between them. The pivots 3 are to the rear of the pivots E,connecting the skip to the frame A, and preferably at a lower level. Theupper, outer, portions of the stiiiiegs are pivotally connected with theskip by links 11, 11, preferably formed of rigid material, the pivotalconnection with the stifileg being indicated at 4:, and that withthc'hopper portion of the skip at 12. It will be noted that theconnections between the stiiilegs and the skip, formed by the links 11are of fixed length, that is to say, they are not lengthened orshortened during the oncration of the apparatus.

The cable 5 by which the movements of the skip are controlled has itsouter end connected to the upper, outer, end of the stifiileg 2, asindicated at 4. In the arrangement shown the cable passes to and acrossan idler sheave or pulley 6 supported in the upper part of the frame A,and thence downward to a winding drum 7, mounted in the lower portion ofthe framework. On the shaft that carries the winding drum is supported alarge drum or bull wheel 8 to which is secured a cable 9 leading to thepower driven winding drum 10. The parts which have been referred to,such as the s i ilegs, links 11, and cable 5, may be duplicated, as thepreferred arrangement when the skip is of large capacity and subject touneven loading; or there may be but one of each of the said parts, inwhich event the connection with the skip and the arrangement of theparts would be in the plane of the lon 'itudinal center of the skip orloading vessel. We therefore in describing the operation of theapparatus and in the following claims, refer to these parts in thesingular number, with the understanding that they may be duplicated ornot, as circumstances may require. The pulleys 6 are located at thesides of the framework of the machine so that the cables 5 are butlittle diverted, laterally, in passing from the ends of the stifflegs tosuch pulleys.

The parts of the apparatus illustrated being in the position representedby full lines in Fig. 1, a position occupied by the skip or vessel Cwhile receiving its charge, if

power be applied to the cable 9, by rotating the drum 10, the cable 5will be wound upon the drum 7, swinging the stiilleg 2 upwardly andforwardly. This movement will be connnunicated to the skip through theconnecting links 11. Owing, however, to the location of the pivots E and3, of the skip and stiiiieg, respectively, and to the arrangement of thelink 11, the stiiileg and skip have diiierential movements. The aretraversed by the skip, from its loading to its discharging positions,being greater than that traversed by the stitheg.

In the drawings an intermediate position of the parts, between thosejust referred to, is indicated by dot and dash lines.

It will be seen that by the arrangement described the parts of themechanism employed for controlling the movements of the skip do notextend much, it any, above the framework A of the machine. This is afact of practical importance, since it permits the machine to be movedin transit, and to be manipulated, in positions that could not beoccupied by the machine were the operating parts located high above thedrum and other moving parts of the mechanism, as has heretotore been thepractice.

What we claim is 1. The combination with a supporting frame and aloading skip pivotally united thereto, of a stifi'leg pivoted to theframe at a point to the rear of and below the pivot for the loadingvessel, the stiii'leg extending from its pivot upwardly and rearwardlyso that its upper end is above the hopper portion of the loadin sk'p,rigid link pivotally connecting the upper, outer, end of the stitilegwith the hopper portion of the skip, a cable by which the movements ofthe skip are contri'illed, secured to the stil'lleg and a windingmechanism for the cable mounted in the supporting frame.

2. In a loader for a concrete miner, the combination with a supportingframework, a mixing drunrmounted therein, and a pivoted loading skiparranged to deliver to the drum when elevated, having a delivery spoutsection and a loading section that flares towards its outer or rear end,or a pair of stiiiiegs pivoted to the fran'iework and 02'- tendingrearward, one on each side of the skip, a pair of rigid links, onebetween the upper end or? eachstitlieg and a side of the flaring portionof the skip, a pair of pulleys located one at each side of theframework, cables extending from the free ends of the stiiiiegs over thepulleys, and means for winding up the cables.

ijroi'n DitnEGER.

